Drayton RF2 digistat broken clips?

Hi, my husband was a little over zealous when replacing the batteries and has broken a clip or two off the back of the unit. The batteries now are not held securely and hence the unit doesn't stay powered up = no heating! Are there any replacements I can buy or have I got to buy a whole new unit (which now works perfectly well, just doesn't look good sat with two clamps on it to ensure the batteries are touching the connectors. Any advise would be appreciated. Thanks